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相关概念视频

Formation of Complex Ions03:45

Formation of Complex Ions

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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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Colloidal precipitates01:09

Colloidal precipitates

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The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
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Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

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Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
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π Electron Effects on Chemical Shift: Overview01:27

π Electron Effects on Chemical Shift: Overview

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An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0,...
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Metal-Ligand Bonds02:51

Metal-Ligand Bonds

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The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
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Colors and Magnetism03:02

Colors and Magnetism

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Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
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在两电子银纳米集群上的兴奋剂效应.

Wei-Jung Yen1, Jian-Hong Liao1, Tzu-Hao Chiu1

  • 1Department of Chemistry, National Dong Hwa University, Hualien 97401, Taiwan, Republic of China. chenwei@gms.ndhu.edu.tw.

Nanoscale
|March 21, 2024
PubMed
概括
此摘要是机器生成的。

将铜添加到银超原子 ([Ag10]) 中,形成具有改变光学特性的合金 ([CuxAg11-x]). 这项研究探讨了金属兴奋剂对银纳米集群结构和光物理学的影响.

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科学领域:

  • 无机化学 无机化学
  • 材料科学 材料科学 材料科学
  • 纳米技术纳米技术

背景情况:

  • 银纳米集群表现出独特的电子和光学特性.
  • 超原子集群通过受控合成提供可调节的特性.
  • 了解纳米集群中的金属兴奋剂对于开发新材料至关重要.

研究的目的:

  • 为了研究金属添加和兴奋剂对2电子银超原子的影响,[Ag10{S2P(OPr) 2}8] (Ag10).
  • 用铜和其他金属进行兴奋剂后,描述银纳米集群的结构和光学变化.
  • 为了探索添加剂的银纳米集群的光物理行为.

主要方法:

  • 银纳米集群及其金属杂类型的合成.
  • 使用单晶X射线衍射 (SCXRD),ESI-MS和NMR光谱学进行结构和组成分析.
  • 使用密度函数理论 (DFT) 计算的理论研究.
  • 通过吸收和发射光谱学进行光学表征.

主要成果:

  • 将Ag+添加到Ag10中,其定量形式是[Ag11{S2P(OPr) 2}8(OTf) ] (Ag11).
  • 复合铜会产生合金[CuxAg11-x{S2P(OPr) 2}8]+ (x=1-3),而添加黄金会导致分解.
  • DFT计算提供了对合金中铜位点位置的见解.
  • 铜兴奋剂诱导了低能量吸收带的显著蓝色转移.
  • Ag11和CuxAg11-x都表现出强烈的室温发光与溶色.

结论:

  • 金属添加和兴奋剂显著影响银纳米集群的结构和光学特性.
  • 该研究有助于理解纳米集群的形成及其光物理特征.
  • 在超原子集群中定制金属组成为新型材料设计提供了一条途径.